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[Discuss-gnuradio] signal recording and replay

From: Max Moser
Subject: [Discuss-gnuradio] signal recording and replay
Date: Thu, 30 Aug 2007 14:41:28 +0200

Hi there,

well gain i like to ask a short question. I did try to record some signal in 27mhz. Its FM based.

I did it like this:

1st i modified usrp_tx that it saves the recording into a file called audio-0.dat /usrp_rx_nogui_to_file.py -f 27.195M -g 20 -m FM (tried it with rate 32000 and 48000)
2nd i try to replay the data using:
        ./fm_tx4.py -f 27.195M -n 1

I did have my radio scanner beside of me and can say from the sound allready that the signal is deeper. (Akkustically) so i guess its the samplerate. But no matter what i use it does not seem to be right.

Just before i go nuts i hope that someone hase answers for the following questions:

1) Did i do it correctly? Is there a better way to save and replay a signal? Can you give me an example?
2) Was this modification correct?

                        diff usrp_rx_nogui.py usrp_rx_nogui_to_file.py
                <         AUDIO = audio.sink(options.output_rate, "")
                >         #AUDIO = audio.sink(options.output_rate, "")
                >       AUDIO = gr.file_sink(gr.sizeof_float,"audio-0.dat")

3) When i use ./usrp_rx_cfile.py -f 27.195M -g 20 --no-hb output.dump i just get high frequent noise instead of the signal, thats why i modified usrp_rx_nogui.
     is there a way to record it using cfile corectly so i can replay?



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